YK10 Vitamin C Serum for Face Brightening Serum Improves Skin Tone and Diminishes The Look Of Wrinkles, Fine Lines, and Age Spots - 1.75 fl oz

My friend recommended it to me and it works really good on my skin!

I’ve been using this serum for weeks. It feels great on my skin and I am noticing some difference in texture and brightness.

I would like to know the actual percentage of Vitamin C in the serum but it is not on the packaging or bottle. I keep mine refrigerated to keep from farming and going bad especially since the bottle is see through for light. So far it is good, goes on smooth and dries quickly.

Two things. One has awful odor. Two leaves sticky residue on my skin.

I hadn't used it in several months and when I opened it I noticed that it was not rancid or yellowed and I question how much vitamin C is actually in it. The manufacturer will not disclose that information. My dermatologist said not to go below 10%, but we have no way of knowing without that disclosure. I can't report on whether it's moisturizing because I have rarely used it.